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Although the interior of the missile has been largely stripped of equipment, there are a number of items still attached to the aft skirt.

Picture 3 of 3.

I believe that the larger-diameter rods are used to provide structural rigidity to the aft end of the skirt. Referring to the Jupiter at Air Power Park (which still has its engine), the smaller-diameter rods hold a fixture around the engine's throat (presumably to anchor the flame curtain).